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  • Polymer and Materials Science  (5)
  • Perennial ryegrass  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Coexistence and the productivity of white clover-perennial ryegrass mixtures (1989)
    Springer
    Theoretical and applied genetics 77 (1989), S. 65-70 
    Details
    ISSN: 1432-2242
    Keywords: Coexistence ; White clover ; Perennial ryegrass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Yield comparisons between five white cloverperennial ryegrass mixtures, whose individual components had previously coexisted, and a corresponding set of ten mixtures based on components that had not coexisted disclosed a yield advantage to the former group of 8.5% over a 4-year period. All five clover populations produced their highest yields when associated with their coexisting grass. The coexisting mixtures also yielded more grass in spring, probably due to the exotic origin of the majority of the companion grasses, reinforced by the nitrogen transfer process between clover and grass. The relative proportions of clover attained by the five populations was apparently unaffected by grass companion. These results are briefly discussed in the context of improving the productivity of white clover-perennial ryegrass mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292317
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The three C's — competition, coexistence and coevolution — and their impact on the breeding of forage crop mixtures (1990)
    Springer
    Theoretical and applied genetics 79 (1990), S. 168-176 
    Details
    ISSN: 1432-2242
    Keywords: Competition ; Coexistence ; Coevolution ; White clover ; Perennial ryegrass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The role of competition, coexistence and co-evolution in the formation of plant communities is discussed, particularly in relation to the breeding of improved grass/legume mixtures. Competition occurs whenever the demand for a particular resource outstrips supply, with the pressures generated within a species expected to exceed those between species. These pressures must be withstood before populations can coexist within a community. This is accomplished by a process of niche diversification, arising from temporal or spatial differences between the populations, that enables them to draw on resources not readily available to their competitors. Coexistence is crucial to the success of any breeding programme designed to raise the productivity of grass/ legume pastures, because it enables components to adapt not only to the environment which they share, but also to each other. A strategy that improves the “general ecological combining ability” of one or both components by a process of recurrent or reciprocal recurrent unilateral adaptation may prove successful, particularly if existing niche differences are increased thereby. Although both processes may give rise to populations which have apparently coevolved, only those resulting from reciprocal recurrent selection will meet the criteria of specificity and reciprocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225947
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  • 3
    Electronic Resource
    Electronic Resource
    The measurement and analysis of competitive ability among populations of white clover and perennial ryegrass (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 361-368 
    Details
    ISSN: 1432-2242
    Keywords: Inter-specific competition ; Intra-specific competition ; Co-existence ; White clover ; Perennial ryegrass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Analysis of the competitive interactions among a set of white clover and perennial ryegrass populations indicated that the intra-specific pressures exerted by the white clover plants upon themselves were significantly greater than the inter-specific pressures they exerted upon the perennial ryegrass. This partitioning of competitive effects could not be carried out on the ryegrass populations, however, because the data required the fitting of separate models to monocultures and duocultures. Although not significant at this stage of the experiment, trends were detected among some of the clover-ryegrass duocultures that could be related to their previous coexistence. The results are briefly discussed in relation to the problems surrounding the measurement of competitive effects among species that ideally require very different managements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265335
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  • 4
    Electronic Resource
    Electronic Resource
    The inflation of thick-walled inner tubes and tires (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 11-19 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Approximate analytic results for two problems involving the inflation of rubber inner tubes and tires are summarized with a view to prompting a comparison of the theory with experimental results. The problems considered are the uniform inflation by internal pressure of a toroidal rubber inner tube or tire which is a perfect torus either in the deformed or undeformed state. The inner tubes or tires are assumed to be free to inflate, that is, they are assumed not to be constrained, for example by a wheel.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270102
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Siloxane copolymers with laterally and terminally attached mesogenic side chainsThe authors thank the Science and Engineering Research Council for financial support of the research of which this work was a part. (1989)
    Weinheim : Wiley-Blackwell
    Advanced Materials 1 (1989), S. 292-294 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19890010808
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  • 6
    Electronic Resource
    Electronic Resource
    Carbon fiber-reinforced carbon as a potential implant material (1978)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 12 (1978), S. 35-42 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A carbon fiber-reinforced carbon is being evaluated as a promising implant material. In a unidirectional composite, high strengths (1200 MN/m2 longitudinal flexural strength) and high modulus (140 GN/m2 flexural modulus) may be obtained with an interlaminar shear strength of 18 MN/m2. Alternatively, layers of fibers may be laid in two directions to give more isotopic properties. The compatibility of the material with bone has been studied by implanting specimens in holes drilled in rat femora. For a period of up to 8 weeks, a thin layer of fibrous tissue bridged the gap between bone and implant; but this tissue mineralizes and by 10 weeks, bone can be observed adjacent to the implant, giving firm fixation. Potential applications include endosseous dental implants where a greater strength in the neck than that provided by unreinforced carbon would be advantageous.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820120104
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  • 7
    Electronic Resource
    Electronic Resource
    Differential thermal analysis of silicones (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 55 (1961), S. 419-422 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Differential thermal analysis has been applied to several silicone polymers and compounds with the use of oxidative conditions. The model compounds gave melting points corresponding to literature values. However, volatilization gave a broad endotherm much lower than extrapolated boiling points. The order, in oxidative resistance, was dimethyl silicone oil, silphenylene, methyl phenyl silicone oil.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1961.1205516139
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation and polymerization of vinyl esters of cyclic and polychloro fatty acidsPresented in part at the 141st National Meeting of the American Chemical Society, Washington, D. C., March, 1962. (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 2523-2532 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Homopolymers and vinyl chloride copolymers have been prepared from the vinyl esters of mixed hydrogenated cyclized linolenic acid, 9,10-dichlorostearic acid, 9,10,12,13-tetrachlorostearic acid, 13,14-dichlorobehenic acid, 9(10)-phenylstearic acid and technical behenic acid. Vinyl 13,14-dichlorobehenate (29%)-vinyl chloride (71%) gave a copolymer with a brittle temperature of -2°C. All of the other copolymers with vinyl chloride had brittle temperatures of 16°C. or higher and behaved more like rigid plastics.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020604
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